package thread;

class Counter{
    private int count = 0;
    synchronized public void add(){ count++;}

    public int get(){return count;}

    public synchronized static void func(){
        synchronized(Counter.class){}
    }
}

public class Demo18 {
    public static void main(String[] args) throws InterruptedException {
        StringBuilder stringBuilder;
        Object locker = new Object();
        Counter counter = new Counter();
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                synchronized(locker){
                    counter.add();
                }
            }
        });
        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                synchronized (locker) {
                    counter.add();
                }
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println(counter.get());
    }
}
